Loop /Page through query in 100 record chunks?

Hello,

I am querying a table for a list of thousands of ID's which I want to want to store in a variable and then pass in a webservice call in 100 record chunks to get additional information about the records.

I can figure out how to make the webservice and retreive the data but what I dont know how to do is page through the query. Can anyone point me at the right transformation steps I should look at to accomplish this, for example, single threader?

http://wiki.pentaho.com/display/EAI/Single+Threader

Thanks